2. Whereas the RSS feed used to be discover-able from a user's profile/home page you now need to go digging in the code and work out what the user's twitter ID is and format URL from that: http://twitter.com/statuses/user_timeline/USER_ID_GOES_HERE.rss.

3. Thrid party sites and services have also sprang up that can create a feed of your tweets. Additionally, Twitter have effectively deprecated relying on the existence of these feeds at all.